Kalrez® O-Ring Selection Guide - Order Online

Order DuPont Kalrez® o-rings from the world's largest independent stocking supplier. We are high performance FFKM Kalrez ® o-ring experts. We also supply Kalrez ® alternative perfluoroelastomer FFKM o-rings such as Markez ® o-rings, and Chemraz ® o-rings.

Kalrez ® o-rings from Marco Rubber are available in a wide variety of DuPont perfluoroelastomer compounds, including Kalrez ® 4079, Kalrez ® 6375, Kalrez ® 7075 to meet extreme application conditions like high temperature o-ring sealing and extreme o-ring chemical compatibility. Kalrez ® 4079 compounds feature low compression set performance o-rings. Kalrez ® 6375 compounds are widely used in the chemical process industry, as they have excellent broad chemical resistance and mechanical properties. Kalrez ® 7075 can perform in high temperature O-Ring environments up to 620 ºF (325ºC).

Contact a high performance perfluoroelastomer o-ring sealing expert today for help selecting the best FFKM O-ring compound for your application.

Choose Marco Rubber & Plastics for your Kalrez® O-Rings

For more than 40 years, Marco Rubber & Plastics has been offering custom and standard o-rings and other sealing solutions for multiple industries. With millions of products produced and shipped annually, we are the experts your organization needs to seal the success of your application. Explore standard size o-ring sizes below.

Kalrez® Compatibility and Order Online Kalrez® O-rings In Stock from an Expert

TEMP, °C (°F)
( ASTM D2240 )
( ASTM D412, 500 MM/MM (20IN/MM) )
( ASTM D412, 500 MM/MM (20IN/MM) )
( ASTM D412, 500 MM/MM (20IN/MM) )
TR-10, ºC / ºF
(ASTM 1329)
K6375 275 (527) 75 7.24 / 1050 15.16 / 2200 16025-3 (26.6) A carbon black-filled product for general use in O-rings, seals, diaphragms and other parts specifically for the chemical process industry. This product has excellent broad chemical resistance, good mechanical properties, and outstanding hot-air aging properties. Kalrez ® Spectrum™ 6375 is well suited for use in mixed process streams because of its excellent resistance to acids, bases, and amines. It is also recommended for use in hot water, steam, pure ethylene oxide and propylene oxide. Get QuoteBuy Online
K7075 327 (620) 75 7.58 / 1100 17.91 / 2600 16012 -4 (24.8) Enhanced physical properties including very low compression set and improved seal force retention. It is a carbon black-filled product utilizing proprietary cure chemistry. Its mechanical properties are designed for improved sealing performance in both high temperature environments and temperature cycling situations. Kalrez ® Spectrum™ 7075 O-rings have a glossy finish. This product was specifically developed for the chemical and hydrocarbon industries to provide improved chemical and thermal resistance better than the industry standard set by Kalrez ® 4079. Get QuoteBuy Online
K4079 316 (600)757.24 / 1050 16.88 / 2450 15025-2 (28.4) A low compression set product for general-purpose use in O-rings, diaphragms, seals, and other parts used in the process and aircraft industries. It is a carbon black-filled product with excellent chemical resistance, good mechanical properties, and outstanding hot air aging properties. It exhibits low swell in organic and inorganic acids and has good response to temperature cycling effects. This product is not recommended for use in hot water/steam applications or in contact with certain hot aliphatic amines, ethylene oxide, or propylene oxide. Get QuoteBuy Online
K680 225 (437) 806.89 / 1000 15.86 / 2300 16038-5 (23.0) A non-black product specifically developed for chemical processes involving hot, aggressive amines. It has also been successfully used in applications involving highly oxidizing chemicals. In addition, it has excellent overall chemical resistance. This cream colored product is easily identifiable when selecting an O-ring material for harsh chemical plant services. Get QuoteBuy Online
K7090 325 (617) 90 15.51 / 2250 22.75 / 3300 7512 -5 (23.0) A product for uses requiring higher hardness/higher modulus than more typical applications. Kalrez® Spectrum™ 7090 perfluoroelastomer parts are well suited for both static and dynamic applications as well as specific sealing applications requiring extrusion resistance at high temperatures. These specialty black parts have excellent thermal and mechanical properties, including excellent compression set and seal force retention, resistance to temperature cycling effects, and rapid gas decompression (RGD). Short excursions to higher temperatures may also be possible. Get QuoteBuy Online
K0090 250 (482) 95 14.20 / 2060 19.51 / 2830 8040 -7 (-19.4) A black product with broad chemical resistance combined with high modulus and high hardness. Kalrez® 0090 parts have outstanding resistance to extrusion and rapid gas decompression (RGD). This product has been independently tested and certified by the Materials Engineering Research Laboratory (MERL – UK) to meet NORSOK-M-710 Rev 2 requirements. Get QuoteBuy Online
K0040 220 (428) 70 6.61 / 960 13.72 / 1990 18038 -17 (1.4) A black product specifically designed for low temperature environments where significant chemical resistance is required. Kalrez® Spectrum™ 0040 parts maintain elasticity and seal force at temperatures unattainable by other perfluoroelastomers. Get QuoteBuy Online
K1050LF 288 (550) 82 12.40 / 1080 18.60 / 2700 12535 -4 (24.8) A carbon black-filled product for O-rings, seals, and other parts used in chemical process industries. It has good hot water/steam, and excellent amine resistance. Kalrez® 1050LF is not recommended for use in organic acids, or inorganic acids at high temperatures. Get QuoteBuy Online

Kalrez® Semiconductor Compounds Kalrez O-ring FFKM Comparison

Miscellaneous Kalrez® Properties

Many miscellaneous properties are of interest for specific applications. Some of these are unaffected by compound choice, while others vary with hardness or extensibility. As an example, coefficient of friction typically increases as hardness decreases. In general, miscellaneous physical properties are similar to those of Viton® fluoroelastomer.

Note: Other specialty or custom compounds may be available or developed to applications that require different properties than the above compounds offer: 8375, 8385, 8101, 4001......

Kalrez Compound Comparison

Click here to view our Kalrez O-ring FFKM Comparison

The information set forth herein is furnished free of charge and is based on technical data that DuPont Dow Elastomers believes to be reliable.  It is intended for use by persons having technical skill, at their own discretion and risk.  The handling precaution information contained herein is given with the understanding that those using it will satisfy themselves that their particular conditions of use present no health or safety hazards.  Because conditions of product use and disposal are outside our control, we make no warranties, express or implied, and assume no liability in connection with any use of this information.  As with any material, evaluation of any compound under end-use conditions prior to specification is essential.  Nothing herein is to be taken as a license to operate under or a recommendation to infringe on any patents.

*Not to be used for specifications

Kalrez® Semiconductor Compounds

Kalrez O-ring FFKM Comparison

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